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What application do I use to install (xpi file) Clip to Devonthink?

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I've tried the usual method of installing an addon (dragging to Firefox window). The icon shows up in my toolbar. But when I attempt to use the addon, I'm told I need to select an application to open it. What application do I need to do this?

I've tried the usual method of installing an addon (dragging to Firefox window). The icon shows up in my toolbar. But when I attempt to use the addon, I'm told I need to select an application to open it. What application do I need to do this?

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Firefox should that for you by default but maybe something wrong with your folder options any way if you would like to install that addon press Ctrl+Shift+A it'll open the about:addons address,

You'll find a settings icon beside the search box press it, Install Add-on From File and locate your Add-on path.
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You might want to post in the Devonthink support forum.
http://forum.devontechnologies.com/